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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa833d5873a462e88aeae8a3e8a795aac0a539d33ea9548f1a3fccc3f8bee19b' 
  AND token = '8ff7QB29UwydAXr9Or9UCeIeM/B4d+UKc5vjPf/j7mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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