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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad3d5c62d93145c8ae1233090271496f420ea34612bcfcebce59e9e6adff0b2' 
  AND token = 'RxGeZ3dAgssoOquVz+xYRqKVoYmJu1dfyK9I+/Cd1UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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