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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d389bfc803f60ee0ba86beb2aa7fc23464c77a7d187e26a1b7652e1eb3506ef' 
  AND token = '1MKD1mvUg1Nn5O+zEywWj5Xc9SktiuqhpymFsYu/8UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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