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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6184724097475aaacd482f2c79f732a5d732e0be67f0cc69b18c07eb414611b' 
  AND token = 'nH9soqMKbWMtDswebvqCRhyOwfK6Gvb1faXSE1rqu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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