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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9dc713b21f48adb144c9c80f298250d8e2995f4d08378483f069f8b578b8f92' 
  AND token = 'tuYoZVcxJ3h9G09YA8x2DlXlaFY/F+vOse79UTSxfe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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