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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6785c2daa3d700b5989d6a0d6c27e35a9e200192923281514f81a902620a01c5' 
  AND token = 'OxmrlFEb2XM6VXW0hJ9PUbqGHngOkjYh1ZJ/Nvv1WEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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