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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62d0777616df49d09c64418942affa30fc15963789920c81451d187f3e7762c' 
  AND token = 'klrpLj8WOgRm1nhNB9U6mHD99kRJtjdcVa1/A03XEro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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