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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9575a2b431da848d053f0e6d29564a6332caed6db046e2fc132912abb0e005c' 
  AND token = 'mwYQFrWvuQv4jTPVkQkLmYVS0QT4Kb4U/lbZqhNiHEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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