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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bc003ab224261618ebc60df95387ce0c6bde995f957e3ae59f2dddfc235a46' 
  AND token = '/7+jDDrXX0ADJ5D3fh22vATyM1tzQpbaASyDw9kMXa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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