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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc269a86e2455dcf3ccf61d28964da801ad00766b84d6432d99ce383c3583fc' 
  AND token = '3qUe390ht3BTLhn6K3pORFe0lVFdhqi1J0S6wrQd1Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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