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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a6c86bcaa1d0311bff653eab78d6f70a8cea173f75e4441b27dfa01a42874b' 
  AND token = 'V9RpYQvstbSUDRl2+VXg+Cd2rWJA5B/feiLc7yKHcfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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