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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414c76a651a065762d50fa1c1f8762d9871f18303eb2e256aee83e6db3f1fc92' 
  AND token = 'eLw2Ncw81aF3PXNfsnjCeqZG0Jct2etfG80HfEeFcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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