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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c215b6f13996f6641b2a5485130b08871262c5e07bedd1c11a5dd9a64ced13a3' 
  AND token = 'D0kGh8L0SbY5PwnaMy1BhIKiq0hHLk7LEXyDwDzfH/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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