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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef6caf25afdef16b2a6aa31edf1bce8fdec63ddae022bc5c88093a87e5fd72a' 
  AND token = '24Xl5wMx74ijtCvNKcJdGqvpl7Nej38BYwPgMgj1U6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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