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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f8d08d69bc10cddde06f4caa8a1b45b29b8773466edc39edd1ae64c5734816' 
  AND token = 'En4ikyGlHM0bPnivcdWAlUP3vzAO7AOxTy4ummBZl4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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