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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b68cc43b266d8556a850a8b11ed20cfba22ae72178264a20e54ee4384cd5f6d' 
  AND token = 'C78qQ1ZZdQMwkj6/zxzNdWLJr5G5rr5d+ylc8oYkZwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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