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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973b27b6296483b617e9b336d029729db05b13587cf52b4f95685fa6c3c4b08a' 
  AND token = 'eIzCR1miEnsekM2pRd2iDmoOKnBrsB99Zp7nM1RIhEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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