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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73cb798ec6d71e54f7955fcb909e29e1028d1fc76dd2b6de2ada2273300f2fb' 
  AND token = '/x7NZzs76K67JNnbk7S3b4mAg+vU7BVUQGreBeIvIQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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