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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acba55e5ab213e98cb663b28481670e56e84603c55330e88524b7b8faee4197' 
  AND token = 'jtpB4e+eKlcx5wLI9cPa9sb6acPjf9IadHMscflOWm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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