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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b5e2dc8c1dee9bc58e2bcfc98a9b376b95a27d3a11a93a19df19d6e2b63c47' 
  AND token = '/MhBGtmYNrFBowb/u/hAiEr0Kq29/Nwko+zqy0hhmYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}