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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6add25e3c5b7a58e65bd377c4cd875a0aff2d1d658200a7715e9813d286cf4f0' 
  AND token = 'Tuoy+CViTQ9/9o8IXjiJ37AWktRus1HDAa8s58Y7QNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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