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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb8e107eb16a3d49a43ff9140357c1dda084db85e3f5c23f5fd286730db9ba7' 
  AND token = 'HMIaxKvyWSnM8t+fWbKzrEXCvHCkwsM6YHkhOeLy6Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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