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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ccaa65a94323a14feff452b21baab53ccd3c4cda91d7deb40f10be5601a6fe' 
  AND token = 'tN0dCKjFiU9hf855bFE5NRg+QwlWJkUaB3BXPTbK04A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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