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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cd035fefff19cb045761b6b8687cef37d9eda5adcbec86ab0497139bbdda0e' 
  AND token = 'SlOGZL6O6dGkGOzyPyarl4l14+34oVSRrD8LV5dS/Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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