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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251f28f2f3f0d22e2f6d2b47fae9b6df4fccf041ccdeb12bd69b14bd0616a666' 
  AND token = 'pharPAinjpyC0+qnCXm3Ftd78fGaLiOG5VbCBHf9Gok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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