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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b50b8be8286248cb6809197d9c31258895925b9b60a1a4a59fca84b8a65e754' 
  AND token = 'r6pp+MuPkycbuDfqKn+QbfpEK3pmxk6M8YkIDc178sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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