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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0907ee7fa317f366be68d30a3e8af3b2c1124e965e26a36e9817df22a9b7b2a5' 
  AND token = '7zqJkttVzkZRAbqJ0G2wqKT7MYt+fkyNV3o6hIcM9BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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