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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147424fae7869b05980d3f04d98647b66f8cabc32c118750cfbc450f96c6a203' 
  AND token = '8j/ukU6M1yVuiL7Cx4G18t97/s9Lr+Ci/lmS0EZpxVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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