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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f803e8d68e1bdab3741043c428f73d4ddd0d8f384610952cb6d733ce91046b3' 
  AND token = 'Bu4JqAsTaN6tqzspsBetA9hbXZE1uZaZaB8G3oJUx/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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