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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c33de1409e24557a213617232947dde63f5bbbd938104aa7ee51650137d25c' 
  AND token = 'qvOupK/vfNldX8Hu2IcY71AQQk+qKS/9227mMv+nCGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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