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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556e4fd6fb34a3d6930fd05a2eded9cda728668bf4efa9bb2430ef33c4e90eba' 
  AND token = 'W/IkSH7RlYXCQ9xV72a/CvZSBEMw+B6sTzMI/h3iCsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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