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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819db972098c85322eb74e4aa8efbb03d9ab901fcb5fc5d7f290b99b3d5a353e' 
  AND token = '+Wunx39hsmsqa3dLbgcn472oFHbsMIL7+7xbaE81Bbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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