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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ff05db3b58b605ca9d6be6262c9a6235eb244a0d34703bf40e56edb1f14cd2' 
  AND token = 'NHROoCZfqHZa6IHV8EiDRer1KtrxxKST7m23p+KrYj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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