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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f346b1cea598d76c317ee4a12806f46fdb301e8b290a3b174a35dd57a73bff6' 
  AND token = '1Ms12Ve6MT70GGFw5Juhjbta7PsVTKJlCkMnDIKFekM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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