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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a027fe3c1e66d9bfa1ecbd50b276b5207e0ade9ab8c26fb9cfc0c71422a4a2f' 
  AND token = 'GKS1bL/4EifJJB42f1vQckAq5Hu/0KlPXU6g/h4fL9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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