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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6432a1d634248c0a6584ff13bb04fd04d0eaa6514082c395679e3636fbbe7d' 
  AND token = 'dGjAelMcjoz4Rc3GONu6HW5WNllvV0sR9WKu8qrYUmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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