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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1a2868a475ea0b6013bfcfea9c9397e3a263707659eed49fe0dda5e02bebb2' 
  AND token = 'JEF8py/z0P7qXR0Zpd6k4Lt2hLM0P9d42IFq3wvAEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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