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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7dfe3199db012ac7a997808299882ec68434940fe906e6f5823c7dc6640f41' 
  AND token = 'I5QGBwrske8yPrFoNsCYKJlmypd7atpjRxFePT6uWyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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