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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefb14b55b8fd07b022dcd43e9b3ff6a10e7af81f8e43c019dc9b66086dc6e07' 
  AND token = 'oXCWifpWqnPvGk02O9YyR9Q7Wwf3mRc+nXm3VygIqBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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