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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01db3d626adb338bfb63e71a2c0b324e27c21a142bfa8d2b42f6f42e054ff5e7' 
  AND token = '4uWmb6yeR+ldQVTUUFnTeeogxMp/X+H8nAiV06aH0EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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