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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9634812f6df1da7bc657a08370d4b7f25089470af0653b34122cf7035f8b8403' 
  AND token = 'zj/kmdtDHBXAozujEhtyjBCdkCt0PIRjglC6+1xPO/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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