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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669fa494502cf2100b2c337d3238ae33275c8bf73437b608a6973dcfb3a400ad' 
  AND token = '78CRTCZADmKfU1O9lEmK6q3qM4mjZPi54uratogPa5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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