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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c405210f77fbd215add7aba768bb9370fe814a9a6096e0b5d4dd2783c97bb6d' 
  AND token = 'qOo1XkkhWULHX/9rMJ1YPsakmZxer/bOVKLQ2R6BCZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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