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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf6a18cf773a0eb16c6496ecd86c3e8aac6e5300940bfcfd729959337e401ee' 
  AND token = 'eecP0zJ32udMkpL+akol6Tr89hQRHHiXYKZWJUAzk48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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