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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaa290c273d32c7f350a6a4a517f4f9fffb9d5fbae2b800411c9cac6c997113' 
  AND token = 'vAD0Vx7MDpLX4O5vomWN4vKVZga/urMLM+yEOsKooA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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