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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3217842241d86b08b664eabd8c63f79e5627e1e10d1ac9142da3d5ed9f66a015' 
  AND token = 'RSU6SDtUBMvcW8khp83y0Q15MKUhrEg8g9EHehrkO4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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