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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee6505b48eba3fb97c249e43221f64360b0d491d0c6299fef230f0c1ff94f79' 
  AND token = 'DcA0zV7T0FwOXxbLX8Pt6fnyAOz60fRtMVJr1XqeYgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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