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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dccb409a57ae8623980ef2dc51b5f13ec8365d9f405a570ed187df86f95913' 
  AND token = 'oSEIVpfmCKH4Hgtgw6nW5EKLofr+bT93LALk10Zppt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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