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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76635b40b89d09f8d3c0f3f2fd10d478558adb05f09b25643cf4385c226edf91' 
  AND token = 'iyspmMe1e5kojKBHEkMpyEwbJnNdTAxnr5Efidn2gc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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