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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a93bcc02d851261aa1c55b02baef331c60693147e61bd25e1acaee18851007b' 
  AND token = '7floGu3Q72Zk1e1UEFBzvoPelL/q6XvUac9pVK23No8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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