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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dd8ffb185ef9a696f82d96ed3f7dee2874de71fec8efd1e11d89b10f754ea6' 
  AND token = 'XjfEfvcR9+ulA+AoGUGuYJ6XUiYvD6/k7hRlxbIt/1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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