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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5436a2544a78292bcbdf0a86ddee26f07b7dd978eea772c6a3016303956a49' 
  AND token = 'SBaGzC8bS/CrHHgcmU26Js8Mje6DpONupTn7l7wx2uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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