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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a315f898792a2133ae7d56fec3db6fedabbf5760e6f316f5c67c10c1ccb7ea05' 
  AND token = 'trzfFlyCCKGwFXp9/RmTaZJxyc5/5trdQWbYt1kWwVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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