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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92c906a0bc26f074e64479435c7be6282f36aa1a46d75dccccdc92612edd342' 
  AND token = 'U1qoD3p63JYpzCpfu0KDJiTHbsX7XRVzACEGLA9v8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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