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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c61825002d856b17da577f1d89820b1f2511b0e8ff4682332ad1afd8ace59f' 
  AND token = 'mPYJ87dOiP7bv4DBXdONOYfm6X4vIaQCsdvNh/10iqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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