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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cb570c70d8cf2d0c03cb9a4818bb60cbc8671d01aef3b4fcb750537d533262' 
  AND token = 'XzEzR3fkWcESmfTCXQUbSYEDuYc3gto2+faTq7v1c4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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