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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb472599c2180d56090b70fdf82633e82304313fa841f8416c6f58981b34658' 
  AND token = 'Lu6hANJ8vPSn5Xi1cEFBIUNFbD3/wJ4JRdIrjO9JIpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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