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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b368e2e4bbe54b18ec992f3516af98ef55c436e5e115e05e4aeb07d04e22d0a' 
  AND token = '+cqFnwJffdpk8IjDgK2qVg+7M6IBtP8AMffTb9c1atY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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