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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8589f394b6eaa5819846945f75c40665c7b9431213a1460db0e8dda555b8ca4' 
  AND token = 'AYPnHriIzPpRfwxiB9U57Eh7LJ3tNoAXZCKiHaKNj9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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