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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fd7b0a32b4b38a1f88841449cfb60e4897b4f6c75d6cbd347e7c5d3da0386b' 
  AND token = '5S7f8b0Tx1ST4n+rm4bEDYWnVd8MdMfcG1SxTGofd00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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