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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f531a824a40b375308ee923ea124c66f34d6a4054fcc9a95b01a8bc21630f325' 
  AND token = 'wRcbwndMzHFzQGXzn0Ljs6TZNdRV0HISzVxPcuarXm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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